Coil coating resin
CJ-675 HDP Topcoat Resin
Designed for HDP top coating systems—delivering superior weather resistance, high gloss, strong adhesion, and 5–10 year outdoor durability for prepainted metal applications.
What is CJ-675
CJ-675 is a saturated polyester resin developed for HDP top coating systems in coil coating applications. It is designed for the weather-exposed outer layer, where long-term durability, surface appearance, and gloss retention are important.
As an HDP topcoat resin, CJ-675 is suitable for projects that require stronger outdoor weather resistance than standard PE systems, while maintaining practical processing compatibility, flexibility, and coating reliability.
Why CJ-675 Works for HDP Topcoat Systems
Superior weather resistance for long
term outdoor service
High gloss for attractive exterior appearance
Excellent flexibility for practical forming performance
Strong adhesion for reliable coating system bonding
Good solvent resistance for stable processing and application
Position in the Coating Structure
CJ-675 is designed for the HDP topcoat layer in a complete coil coating system. In a typical coating structure: Topcoat provides weather resistance, gloss, color appearance, and long-term surface performance. Primer builds the bond between the metal substrate and the upper coating layers. Back coat supports reverse-side protection and handling performance. By serving the exposed outer layer, CJ-675 helps provide upgraded outdoor durability, improved gloss retention, and stronger exterior coating value in HDP systems.
Typical Applications
- High-durability roofing and wall panel systems
- Exterior metal building materials
- Prepainted steel for demanding outdoor environments
- Projects requiring 5–10 year practical outdoor durability
- Applications positioned above standard PE topcoat systems
HDP Topcoat Role in System Design
Selecting a suitable HDP topcoat resin helps improve outdoor service life, gloss retention, and long-term coating stability in exposed metal applications.
When matched with appropriate primer structure, substrate condition, pretreatment quality, and curing process, CJ-675 supports reliable high-durability topcoat system design in practical production.
CJ-675 is suitable for projects that require a stronger balance of durability, appearance retention, and system-level exterior performance than standard PE coating solutions.
Technical highlights
Representative reference ranges appear on product pages or in TDS documents. Summary below — request a full TDS or product sheet from our team.
Appearance
Light yellow transparent liquid
Viscosity (Ford cup, 25°C)
18–25 s
Solid content (Wt）
60±2%
Acid value
≤10 mgKOH/g
Fineness
≤15 μm
Weather resistance
5–10 years
Performance focus
High gloss and superior weather resistance
Packaging
200 kg/barrel
Technical data & next steps
Use the links below for matching coatings, selection support, or to request technical documents.